var oldVnode = [1,2,3,4,5,6,7,8,9]
var newVnode = [1,2,3,4,55,6,7,8,9]
var oldLength = oldVnode.length
var newLength = newVnode.length
var commonLength = Math.max(oldLength, newLength)
for (let i = 0; i < commonLength; i++) {
    
    patch(oldVnode[i], newVnode[i])
}

function patch()

function patchElement()